Home > Type Localities I – July 8 > MS0716 Gratonite

Gratonite - Sold


Gratonite is a rare lead arsenic sulfide originally described from Cerro Pasco. Palache and Fischer (1940) described the mineral and Harvard University houses type material. The name honors L. C. Graton, professor of mining at Harvard, and consultant at Cerro de Pasco. Gratonite here forms steel gray prismatic crystals to 3 mm, in a radiating spherical aggregate. Some of the crystals at the base of the specimen are broken, but display from the top is not affected. Seldom available. This specimen comes from Ralph Merrill collection, proprietor of Minerals Unlimited. Purchase includes Merrill's catalog card (and label), accessioned in 1949.